JP2001019683A - Derivative of 1,2-benzisothiazolin-3-one and its preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain in safety and good yield the subject derivative of 1,2- benzothiazolin-3-one having various bioactivities without using a toxic gas by heating a sulfenamide compound. SOLUTION: The objective derivative of formula II (e.g. 1,2-benzisothiazolin-3- one, etc., of formula III) is obtained by carrying out a cyclization reaction of a sulfenamide compound of formula I [R1-R4 are each H, an alkyl, an alkoxy, etc.; R5 is a (substituted)alkyl, a cycloalkyl, etc.], (e.g. methyl 2- sulfenamoylbenzoate, etc.). The reaction is preferably carried out in the presence of a solvent (e.g. toluene, etc.), at 50-150 deg.C, for 2-8 hours.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a 1,2-benzisothiazolin-3-one compound derivative. More specifically, 1,2-benzisothiazoline-3
The present invention relates to a method for efficiently producing a -one compound derivative by heating a sulfenamide compound.

[0002]

2. Description of the Related Art 1,2-Benzoisothiazolin-3-one compound derivatives are known to have various physiological activities, for example, 5-chloro and 6-chloro-1,2-benzoisothiazolin-3-one. Has been reported to have antibacterial and antibacterial activities (Adv. Heterocycl. Chem., 14, 58 (197
2)). Furthermore, among the various 1,2-benzisothiazole compounds derived from 1,2-benzisothiazolin-3-one, there are compounds having a substituent at the isothiazole ring part, as well as compounds exhibiting various pharmacological actions. Is an important compound that has been reported to work (Adv. Heterocyc
l. Chem., 14, 58 (1972), J. Med. Chem., 29, 359 (1
986)). In particular, 1,2-having a substituent on the nitrogen atom at the 2-position
Benzoisothiazolin-3-one compound derivatives are
It has been reported that some compounds exhibit antibacterial activity (Bull. Chem. Soc. Jpn., 55, 1183 (1982)). Saccharin, a sweetener, can also be obtained by oxidizing 1,2-benzisothiazolin-3-one (J.
Chem. Soc., 123, 170 (1923), Chem. Ber., 61, 1308.
(1928)).

Conventionally, 1,2-benzisothiazolin-3-one compound derivatives have been prepared by treating dithiosalicylic acid or thiosalicylic acid with chlorine or bromine and then reacting with amines (US Pat. No. 2870015, Belgian Patent 565380
No. 617384, German Patent No. 1135468, J. Org. C
hem., 40, 2029 (1975)) or a method of reacting thiosalicylic amides with chlorine (Farmaco, Ed. Sci., 16,
509 (1961), 18, 732 (1963), 19, 254 (1964), 22, 93
5, 989, 999 (1967), 23, 468 (1968), UK Patent No. 8481
No. 30, U.S. Pat. No. 3,761,489), but the development of a safe manufacturing method is desired because toxic chlorine and bromine must be used, and there is a problem of corrosion of the manufacturing equipment. . In addition, 1,2-benzodithiol-3-one and 1,2
There is also known a method for producing from -benzodithiol-3-one 1-oxide (J. Chem. Soc., 123, 170 (1923),
Tetrahedron Lett., 37, 5337 (1996)), these compounds are all special reagents, are not readily available, and are unsuitable for industrial practice.

[0004]

DISCLOSURE OF THE INVENTION The present invention overcomes the drawback of using a toxic chlorine gas, which is a conventional method, in producing a 1,2-benzisothiazolin-3-one compound derivative. The purpose of the present invention is to provide an industrially advantageous method for producing a -benzoisothiazolin-3-one compound derivative.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies on a method for producing a 1,2-benzisothiazolin-3-one compound derivative, and as a result, have found that a cyclization reaction can be achieved by heating a sulfenamide compound. The present inventors have found that a 1,2-benzisothiazolin-3-one compound derivative can be obtained safely and easily by causing the above, and based on this finding, the present invention has been completed.

That is, according to the present invention, the following general formula (A)

Embedded image (Wherein, R ^{1 to} R ⁴ represent hydrogen or a substituent, and R ⁵ represents a substituent).
In the method for producing a -one compound derivative, the following general formula (II)

Embedded image Wherein R ^{1 to} R ⁴ represent hydrogen or a substituent, and R ⁵ represents a substituent, wherein the sulfenamide compound represented by the formula ( ¹ ) is subjected to a cyclization reaction. A method for producing a 3-one compound derivative is provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION 1,2-
In the above general formula (A), which represents a benzoisothiazolin-3-one compound derivative, R ^{1 to} R ⁴ represent hydrogen or a substituent. In this case, the substituent may be one which is inert to the reaction of the present invention. Anything may be used. Such substituents include a chain or cyclic alkyl group, alkoxy group, dialkylamino group, acyl group, alkoxycarbonyl group, halogen atom, cyano group, nitro group and the like. The alkyl group bonded to these substituents usually has 1 to 6 carbon atoms. R ⁵ represents an organic group,
The organic group in this case includes an aliphatic group such as an alkyl group or a cycloalkyl group. The carbon number of the alkyl group is 1 to
12, preferably 1 to 6. These alkyl groups and cycloalkyl groups may have a substituent such as a halogen atom, an alkoxyl group, a dialkylamino group, an acyl group, or an alkoxycarbonyl group. The alkyl group in these substituents can be a lower alkyl group having 1 to 6 carbon atoms. To show a specific example of the aliphatic group,
Methyl, ethyl, propyl, isopropyl, butyl, hexyl, cyclohexyl, methoxy, ethoxy, dimethylamino, diethylamino, acetyl, methoxycarbonyl, ethoxycarbonyl, chloro, bromo and the like.

The production of 1,2-benzisothiazolin-3-ones is preferably carried out in the presence of a reaction solvent, wherein the reaction solvent is benzene, toluene, xylene,
The reaction is performed in a non-polar organic solvent such as chlorobenzene, dichlorobenzene, and anisole. These solvents are used alone or in the form of a mixed solvent.

[0009] The temperature in the above-mentioned manufacturing method is 50 to 15 degrees.
The reaction can be carried out at a temperature around 0 ° C. However, if the temperature is too low, the reaction time will be delayed, and if it is too high, the decomposition reaction and side reactions will increase. The reaction time depends on the reaction temperature and cannot be determined unconditionally, but usually 2 to 8 hours is sufficient.

Thus, the 1,2-benzisothiazolin-3-one compound derivative represented by, for example, chemical formulas (1) and (2) can be produced by the reaction of the present invention.

Embedded image

[0011]

Next, the present invention will be described in detail with reference to examples. It should be noted that the embodiments of the present invention are representative ones for easy understanding of the present invention, and the present invention is not limited to these. The 1,2-benzisothiazolin-3-one compound derivatives produced in the following examples are all novel compounds, and the results of various spectra and elemental analysis were identified as main criteria. Moreover, the prepared compound (1) to (2), which corresponds to the compound described in above (1) to (2), as the values of the physical properties, melting point, nuclear magnetic resonance spectra ⁽¹ H-NM
R), infrared absorption spectrum (IR), and elemental analysis values.

EXAMPLE 1 Methyl 2-sulfenamoyl benzoate (2 mmol) was placed in a glass container having an internal volume of 50 ml and toluene (10 ml).
And stirred at 100 ° C. for 5 hours. The toluene was distilled off under reduced pressure, and the crude product was subjected to silica gel chromatography (elution solvent: methylene chloride: acetone: methanol = 1).
00: 5: 1). Further, recrystallization from benzene-hexane gave 1,2-benzoisothiazolin-3-one of the compound (1). Yield 58%; melting point 187.5-189 ° C; ¹ H-NMR (CDCl ₃ ) 3.
98 (3H, s), 6.83 (1H, dt, J = 8, 1 Hz), 7.24 (1H, d
d, J = 7, 1 Hz), 7.40-7.47 (2H, m), 7.57 (1H, d, J = 8
Hz), 7.71 (1H, td, J = 8, 1 Hz), 8.06 (1H, dd, J = 8,
1 Hz), 8.13 (1H, d, J = 8 Hz); IR (KBr) 1688, 1318, 1
281, 1107, 733 cm ^-1 . Elemental analysis value (%) as C ₁₅ H ₁₁ NO ₃ S Measurement value: C, 56.69, H, 3.42, N, 4.36 Calculated value: C, 56.76, H, 3.49, N, 4.41

Example 2 The procedure of Example 1 was repeated, except that methyl 5-chloro-2-sulfenamoylbenzoate was used in place of methyl 2-sulfenamoylbenzoate. I got Yield 29%; Melting point 193-194 ° C; ¹ H-NMR (CDCl ₃ ) 3.99
(3H, s), 6.72 (1H, dd, J = 9, 1 Hz), 7.39 (1H, dt, J
= 9, 2 Hz), 7.52 (1H, dd, J = 9, 1 Hz), 7.66-7.69 (1
H, m), 8.04 (1H, t, J = 2 Hz), 8.10 (1H, t, J = 2 H
z); IR (KBr) 1703,1669, 1449, 1308, 1252, 1123 cm
^-1 . C ₁₅ H ₉ Cl ₂ NO ₃ Elementary analysis as S ₂ (%) measurements: C, 46.95, H, 2.31 , N, 3.50 Calculated: C, 46.64, H, 2.35 , N, 3.63

[0014]

According to the present invention, a 1,2-benzisothiazolin-3-one compound derivative can be produced in good yield by the reaction of the sulfenamide compound in the present invention. Moreover, since it can be produced safely without using toxic gas, it is optimal as an industrial method for synthesizing 1,2-benzisothiazolin-3-one compound derivatives.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Yasuo Kama 1-1 Materials Engineering Technology Research Institute, Higashi 1-1, Tsukuba City, Ibaraki Prefecture (72) Inventor Motonori Shibagami 1-1 Materials Research Institute, Higashi 1-1 Tsukuba City, Ibaraki Prefecture (72) Inventor Toshiyuki Takagi 1-1, Higashi 1-1, Tsukuba-shi, Ibaraki F-term in the Materials Technology Institute (reference) 4C033 AA01 AA19

Claims (1)

[Claims] 1. A compound represented by the following general formula (a): (Wherein, R ^{1 to} R ⁴ represent hydrogen or a substituent, and R ⁵ represents a substituent).
In a method for producing a -one compound derivative, a compound represented by the following general formula (II): Wherein R ^{1 to} R ⁴ represent hydrogen or a substituent, and R ⁵ represents a substituent, wherein the sulfenamide compound represented by the formula ( ¹ ) is subjected to a cyclization reaction. A method for producing a 3-one compound derivative.